| seid | (noun) an Old Norse term for a type of sorcery which was practiced in Norse society during the Late Scandinavian Iron Age. | Synonyms: seidh, seidhr, seidr, seith, seithr |
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| serfhood | (noun) the state of a serf | Synonyms: serfdom, vassalage |
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| serranid | (noun) marine food sport fishes mainly of warm coastal waters | Synonyms: serranid fish |
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| sesamoid | (noun) any of several small round bones formed in a tendon where it passes over a joint | Synonyms: os sesamoideum, sesamoid bone |
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| shad | (noun) herring-like food fishes that migrate from the sea to fresh water to spawn | - |
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| (noun) bony flesh of herring-like fish usually caught during their migration to fresh water for spawning; especially of Atlantic coast | - |
| shaheed | (noun) Arabic term for holy martyrs | - |
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| shard | (noun) a broken piece of a brittle artifact | Synonyms: fragment, sherd |
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| shed | (noun) an outbuilding with a single story; used for shelter or storage | - |
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| sheepfold | (noun) a pen for sheep | Synonyms: fold, sheep pen, sheepcote |
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| sheepshead | (noun) large (up to 20 lbs) food fish of the eastern coast of the United States and Mexico | Synonyms: Archosargus probatocephalus |
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| shepherd | (noun) a herder of sheep (on an open range); someone who keeps the sheep together in a flock | Synonyms: sheepherder, sheepman |
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| (noun) a clergyman who watches over a group of people | - |
| sherd | (noun) a broken piece of a brittle artifact | Synonyms: fragment, shard |
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| shield | (noun) hard outer covering or case of certain organisms such as arthropods and turtles | Synonyms: carapace, cuticle, shell |
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| (noun) armor carried on the arm to intercept blows | Synonyms: buckler |
| (noun) a protective covering or structure | - |
| shinpad | (noun) a stiff protective garment worn by hockey players or a catcher in baseball to protect the shins | Synonyms: shin guard |
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| shipload | (noun) the amount of cargo that can be held by a boat or ship or a freight car | Synonyms: boatload, carload |
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| shipyard | (noun) a workplace where ships are built or repaired | - |
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| shithead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull |
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| shittimwood | (noun) wood of the shittah tree used to make the ark of the Hebrew Tabernacle | - |
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| (noun) deciduous tree of southeastern United States and Mexico | Synonyms: black haw, Bumelia lanuginosa, chittamwood, chittimwood, false buckthorn |
| (noun) shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit | Synonyms: Bumelia lycioides, mock orange, shittim, southern buckthorn |
| shoebird | (noun) large stork-like bird of the valley of the White Nile with a broad bill suggesting a wooden shoe | Synonyms: Balaeniceps rex, shoebill |
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| shorebird | (noun) any of numerous wading birds that frequent mostly seashores and estuaries | Synonyms: limicoline bird, shore bird |
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| shortbread | (noun) very rich thick butter cookie | Synonyms: shortbread cookie |
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| shorthand | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: stenography, tachygraphy |
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| shovelboard | (noun) a game in which players use long sticks to shove wooden disks onto the scoring area marked on a smooth surface | Synonyms: shuffleboard |
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| shovelhead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, bonnethead, Sphyrna tiburo |
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| showerhead | (noun) a perforated nozzle that showers water on a bather | - |
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| shred | (noun) a small piece of cloth | Synonyms: rag, tag, tag end, tatter |
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| (noun) a tiny or scarcely detectable amount | Synonyms: iota, scintilla, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| shroud | (noun) burial garment in which a corpse is wrapped | Synonyms: cerement, pall, winding-clothes, winding-sheet |
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| (noun) (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind | Synonyms: mainsheet, sheet, tack, weather sheet |
| (noun) a line that suspends the harness from the canopy of a parachute | - |
| shuffleboard | (noun) a game in which players use long sticks to shove wooden disks onto the scoring area marked on a smooth surface | Synonyms: shovelboard |
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| sickbed | (noun) the bed on which a sick person lies | - |
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| sicklepod | (noun) North American rock cress having very long curved pods | Synonyms: Arabis Canadensis |
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| (noun) cosmopolitan tropical herb or subshrub with yellow flowers and slender curved pods; a weed; sometimes placed in genus Cassia | Synonyms: Cassia tora, Senna obtusifolia |
| sideboard | (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: buffet, counter |
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| (noun) a board that forms part of the side of a bed or crib | - |
| (noun) a removable board fitted on the side of a wagon to increase its capacity | - |
| signboard | (noun) structure displaying a board on which advertisements can be posted | Synonyms: sign |
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| signified | (noun) the meaning of a word or expression; the way in which a word or expression or situation can be interpreted | Synonyms: sense |
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| sild | (noun) any of various young herrings (other than brislings) canned as sardines in Norway | - |
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| silkweed | (noun) any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts | Synonyms: milkweed |
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| silkwood | (noun) a fast-growing tropical American evergreen having white flowers and fleshy edible fruit; a bark yields a silky fiber used in cordage and wood is valuable for staves | Synonyms: calabur tree, calabura, Jamaican cherry, Muntingia calabura, silk wood |
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| silurid | (noun) Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin | Synonyms: silurid fish |
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| silverrod | (noun) plant of eastern North America having creamy white flowers | Synonyms: Solidago bicolor |
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| silversword | (noun) low-growing plant found only in volcanic craters on Hawaii having rosettes of narrow pointed silver-green leaves and clusters of profuse red-purple flowers on a tall stem | Synonyms: Argyroxiphium sandwicense |
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| silverweed | (noun) any of various twining shrubs of the genus Argyreia having silvery leaves and showy purple flowers | - |
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| (noun) low-growing perennial having leaves silvery beneath; northern United States, Europe, Asia | Synonyms: goose-tansy, goose grass, Potentilla anserina |
| sinusoid | (noun) tiny endothelium-lined passages for blood in the tissue of an organ | - |
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| (noun) the curve of y=sin x | Synonyms: sine curve |
| sipunculid | (noun) small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut | Synonyms: peanut worm |
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| sisterhood | (noun) a religious society of women who live together as sisters (especially an order of nuns) | - |
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| (noun) an association or society of women who are linked together by a common religion or trade or interest | Synonyms: sistership |
| (noun) the kinship relation between a female offspring and the siblings | Synonyms: sistership |
| skateboard | (noun) a board with wheels that is ridden in a standing or crouching position and propelled by foot | - |
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| skid | (noun) an unexpected slide | Synonyms: sideslip, slip |
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| (noun) one of a pair of planks used to make a track for rolling or sliding objects | - |
| (noun) a restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation | Synonyms: brake shoe, shoe |
| skinhead | (noun) a member of any of several British or American groups consisting predominantly of young people who shave their heads; some engage in white supremacist and anti-immigrant activities and this leads to the perception that all skinheads are racist and violent | Synonyms: skin |
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| (noun) a person whose head is bald or shaved | Synonyms: baldhead, baldpate, baldy, skin |
| skunkweed | (noun) tall herb of the Rocky Mountains having sticky leaves and an offensive smell | Synonyms: Polemonium viscosum, skunk-weed |
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| sled | (noun) a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow | Synonyms: sledge, sleigh |
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| sleepyhead | (noun) a sleepy person | - |
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| sleuthhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: bloodhound |
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| (noun) a detective who follows a trail | Synonyms: sleuth |
| slugabed | (noun) a person who stays in bed until a relatively late hour | Synonyms: lie-abed |
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| sluggard | (noun) an idle slothful person | Synonyms: slug |
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| smoothhound | (noun) smooth dogfish of European coastal waters | Synonyms: Mustelus mustelus, smoothhound shark |
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| smorgasbord | (noun) an assortment of foods starting with herring or smoked eel or salmon etc with bread and butter; then cheeses and eggs and pickled vegetables and aspics; finally hot foods; served as a buffet meal | - |
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| (noun) a collection containing a variety of sorts of things | Synonyms: assortment, miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, variety |
| snakebird | (noun) fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill | Synonyms: anhinga, darter |
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| snakehead | (noun) showy perennial of marshlands of eastern and central North America having waxy lanceolate leaves and flower with lower part creamy white and upper parts pale pink to deep purple | Synonyms: Chelone glabra, shell-flower, shellflower, snake-head, turtlehead |
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| snakeweed | (noun) low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads | Synonyms: broom snakeroot, broom snakeweed, Gutierrezia sarothrae, rabbit-weed, rabbitweed, turpentine weed |
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| snakewood | (noun) East Indian climbing shrub with twisted limbs and roots resembling serpents | Synonyms: Rauwolfia serpentina |
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| sneezeweed | (noun) any of various plants of the genus Helenium characteristically causing sneezing | - |
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| snood | (noun) an ornamental net in the shape of a bag that confines a woman's hair; pins or ties at the back of the head | - |
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| snowbird | (noun) white Arctic bunting | Synonyms: Plectrophenax nivalis, snow bunting, snowflake |
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| (noun) small North American finch seen chiefly in winter | Synonyms: junco |
| (noun) medium-sized Eurasian thrush seen chiefly in winter | Synonyms: fieldfare, Turdus pilaris |
| snowboard | (noun) a board that resembles a broad ski or a small surfboard; used in a standing position to slide down snow-covered slopes | - |
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| snowfield | (noun) a permanent wide expanse of snow | - |
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| soapweed | (noun) tall arborescent yucca of southwestern United States | Synonyms: soap-weed, soap tree, Yucca elata |
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| sod | (noun) surface layer of ground containing a mat of grass and grass roots | Synonyms: greensward, sward, turf |
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| (noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male) | Synonyms: bugger, sodomist, sodomite |
| (noun) an informal term for a youth or man | Synonyms: bozo, cat, guy, hombre |
| softwood | (noun) wood that is easy to saw (from conifers such as pine or fir) | Synonyms: deal |
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| solenoid | (noun) a coil of wire around an iron core; becomes a magnet when current passes through the coil | - |
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| solid | (noun) a three-dimensional object, structurally rigid, usually resistant to changes of shape or volume | - |
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| (noun) the state in which a substance has no tendency to flow under moderate stress; resists forces (such as compression) that tend to deform it; and retains a definite size and shape | Synonyms: solid state, solidness |
| (noun) matter that is solid at room temperature and pressure | - |
| songbird | (noun) any bird having a musical call | Synonyms: songster |
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| sorehead | (noun) someone who is peevish or disgruntled | - |
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| sound | (noun) the particular auditory effect produced by a given cause | - |
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| (noun) the subjective sensation of hearing something | Synonyms: auditory sensation |
| (noun) the audible part of a transmitted signal | Synonyms: audio |
| (noun) (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language | Synonyms: phone, speech sound |
| (noun) the sudden occurrence of an audible event | - |
| (noun) a large ocean inlet or deep bay | - |
| (noun) a narrow channel of the sea joining two larger bodies of water | Synonyms: strait |
| (noun) mechanical vibrations transmitted by an elastic medium | - |
| soundboard | (noun) (music) resonator consisting of a thin board whose vibrations reinforce the sound of the instrument | Synonyms: sounding board |
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| sourwood | (noun) deciduous shrubby tree of eastern North America having deeply fissured bark and sprays of small fragrant white flowers and sour-tasting leaves | Synonyms: Oxydendrum arboreum, sorrel tree, titi |
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| southeastward | (noun) the compass point midway between south and east; at 135 degrees | Synonyms: SE, sou'-east, southeast |
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| southernwood | (noun) shrubby European wormwood naturalized in North America; sometimes used in brewing beer | Synonyms: Artemisia abrotanum |
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| southland | (noun) any region lying in or toward the south | - |
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| southward | (noun) the cardinal compass point that is at 180 degrees | Synonyms: due south, S, south |
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| southwestward | (noun) the compass point midway between south and west; at 225 degrees | Synonyms: sou'-west, southwest, SW |
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| sowbread | (noun) common wild European cyclamen with pink flowers | Synonyms: Cyclamen hederifolium, Cyclamen neopolitanum |
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| sparid | (noun) spiny-finned food fishes of warm waters having well-developed teeth | Synonyms: sparid fish |
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| spearhead | (noun) the head and sharpened point of a spear | Synonyms: spear-point, spearpoint |
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| (noun) the leading military unit in an attack | - |
| (noun) someone who leads or initiates an activity (attack or campaign etc.) | - |
| speed | (noun) changing location rapidly | Synonyms: hurrying, speeding |
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| (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: amphetamine, pep pill, upper |
| (noun) a rate (usually rapid) at which something happens | Synonyms: fastness, swiftness |
| (noun) the ratio of the focal length to the diameter of a (camera) lens system | Synonyms: f number, focal ratio, stop number |
| (noun) distance travelled per unit time | Synonyms: velocity |
| spermatid | (noun) an immature gamete produced by a spermatocyte; develops into a spermatozoon | - |
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| spermatozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: antherozoid |
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| sphecoid | (noun) any of various solitary wasps | Synonyms: sphecoid wasp |
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| sphenoid | (noun) butterfly-shaped bone at the base of the skull | Synonyms: os sphenoidale, sphenoid bone |
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| spheroid | (noun) a shape that is generated by rotating an ellipse around one of its axes | Synonyms: ellipsoid of revolution |
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| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| spikenard | (noun) an aromatic ointment used in antiquity | Synonyms: nard |
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| spinsterhood | (noun) the state of being a spinster (usually an elderly unmarried woman) | - |
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| splashboard | (noun) protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side | Synonyms: washboard |
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| (noun) protective covering consisting of a panel to protect people from the splashing water or mud etc. | Synonyms: dashboard, splasher |
| spread | (noun) act of extending over a wider scope or expanse of space or time | Synonyms: spreading |
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| (noun) decorative cover for a bed | Synonyms: bed cover, bed covering, bedcover, bedspread, counterpane |
| (noun) farm consisting of a large tract of land along with facilities needed to raise livestock (especially cattle) | Synonyms: cattle farm, cattle ranch, ranch |
| (noun) a haphazard distribution in all directions | Synonyms: scatter |
| (noun) the expansion of a person's girth (especially at middle age) | - |
| (noun) a conspicuous disparity or difference as between two figures | Synonyms: gap |
| (noun) two facing pages of a book or other publication | Synonyms: facing pages, spread head, spreadhead |
| (noun) process or result of distributing or extending over a wide expanse of space | Synonyms: spreading |
| (noun) a tasty mixture to be spread on bread or crackers or used in preparing other dishes | Synonyms: paste |
| (noun) a meal that is well prepared and greatly enjoyed | Synonyms: banquet, feast |
| spreadhead | (noun) two facing pages of a book or other publication | Synonyms: facing pages, spread, spread head |
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| springboard | (noun) a beginning from which an enterprise is launched | Synonyms: jumping-off point, point of departure |
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| (noun) a flexible board for jumping upward | - |
| spud | (noun) a sharp hand shovel for digging out roots and weeds | Synonyms: stump spud |
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| (noun) an edible tuber native to South America; a staple food of Ireland | Synonyms: Irish potato, murphy, potato, tater, white potato |
| squad | (noun) a cooperative unit (especially in sports) | Synonyms: team |
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| (noun) a smallest army unit | - |
| (noun) a small squad of policemen trained to deal with a particular kind of crime | Synonyms: police squad |
| squid | (noun) widely distributed fast-moving ten-armed cephalopod mollusk having a long tapered body with triangular tail fins | - |
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| (noun) (Italian cuisine) squid prepared as food | Synonyms: calamari, calamary |
| stagehand | (noun) an employee of a theater who performs work involved in putting on a theatrical production | Synonyms: stage technician |
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| staghead | (noun) an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance | Synonyms: hexenbesen, witch broom, witches' broom |
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| staghound | (noun) a large heavy hound formerly used in hunting stags and other large game; similar to but larger than a foxhound | - |
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